Computers are a great way for students to get engaged in learning and practice skills.  Here are some great websites for students to practice some of the skills that we learn at school.
 

http://www.quiz-tree.com/index.html

http://www3.grafton.k12.wi.us/teacher/czozak/kidlinks.html

http://curriculum.leeschools.net/words/words_main.htm 

http://www.internet4classrooms.com/month2month.htm